Furnace door



March 11 1924.

c. H. THORNDELL FURNACE DOOR Filed Aug. 28. 1922 WITNESS:

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mviaNToR ATTORNEY CHARLES H. THORNDELL, GF GONNELLSVILLE, PENNSYLVMQM.

FURNACE 13003.

Application flied August 28, 1922. Serial No. 584,762.

To all whom it may concern: providing an air space 8 between the door Be it lrnown that l, Crrantns I. Trronnand the liner. When it is desired to re- DELL, a citizen of the United States, replace the liner, pin 7 is removed after which siding at Connellsville, in the county of the liner is removed from the door by pulling 5 Q- iyctte and of Pennsylvania, have inblock 6 out of boxing 2, a new liner being vented new and useful Improvements in placed in position and the pin 7 driven 6Q Furnace Doors, of which the following is through the block of the new liner and the a specification. top and bottom walls of boxing 2.

This invention relates to furnace doors. In the form illustrated in F 1g. 3 the spacw and more particularly to the means for ing elements 1 are omitted from the inner securing a liner to the inner face of the door. face of door l and liner 4 is replaced by a Une of the main objects of the invention liner 4 of fireclay or other suitable refracis to provide simple and efficient m ans t material, line P havinga block 6 which wherebv a projecting member or liner may ito boxing 2 and is secured by pin 7. be quickly and easily secured in position t will be seen that l have produced very adjacent to the inner face of a furnace simple and eiiicient means for securing the *0 door, this liner acting in lmown manner liner to the inner face of a furnace door, to protect the door from being damaged by this means permitting a liner to be quickly the intense heat generated within the fur and easily removed and replaced thus ef 2 nace. A further object is to provide means fecting a material saving in time.

of the character stated of simple construc- What I claim is:- tion which may be readily produced at small 1. In combination with a furnace door cost and will not necessitate any material provided with an outwardly projecting cenchanges in the patterns at present used tral boxing of non-circular cross-section, a for casting furnace doors. Further objects liner at the inner face of the door and prowill appear from the detailed description. vided with an integral outwardly projecting so In the drawings element fitting into said boxing, and a mem- Figure 1 is an elevation of the door. ber inserted through said element and the Figure 2 is a section through the door. boxing and coacting therewith to secure so Figure 3 is a view similar to Fig. 2 of a the liner in operative relation to the door.

modified form. 2. In combination with a furnace door at In practicing the invention, door 1, which provided with an outwardly projecting cenis mounted in a suitable frame A in known tral boxing of non-circular cross-section manner, and is formed of cast iron in a and with reinforcing ribs extending from 35 known manner, is provided with a central the boxing and integrally connecting the outwardly projecting boxing or neck 2 of same with the door, a liner at the inner co rectangular cross-section which is reinforced face of the door and provided with an inby ribs 3 extending from the corners of tegral outwardly projecting element fitting neck 2 to the corners of the door. In the into said boxing, and a tapered pin inserted no form illustrated in Fig. 2 I provide a cast through the boxing and the projecting eleiron liner 4 which is reinforced by brace ment of the liner. o6 ribs 5 provided on its inner face. This 3. In combination with a furnace door liner is provided, on its outer face, with an provided with an outwardly projecting boxoutwardiy projecting block 6 which fits ing of non-circular cross-section, a liner 4 ,5 snugly in neck 2, this block being provided positioned adjacent to the inner face of the withacentral bore for reception ofatapered door and provided with an integral outpin 7 which is inserted through alined openwardly projecting element fitting snugly lngs in the top and bottom walls of neck or into said boxing, and a member inserted boxing 2. This pin serves to efiectually through said element of the liner and the so secure the liner to the door, as illustrated. boxing and acting to force the liner to- Preferably, though not necessarily, the door ward the door and to secure the door and is provided on its inner face with spacing the liner together. elements 1 which serve to hold liner 4 in In testimony whereof I afix my signature. spaced relation to the inner face of the door CES H. THORNDELL. 

